package ai.kastrax.a2x.security

import ai.kastrax.a2x.model.AuthenticationType
import java.util.UUID
import java.util.concurrent.ConcurrentHashMap

/**
 * A2X 安全服务
 */
class A2XSecurityService {
    /**
     * API 密钥映射
     */
    private val apiKeys = ConcurrentHashMap<String, Principal>()
    
    /**
     * JWT 密钥
     */
    private var jwtSecret: String? = null
    
    /**
     * JWT 发行者
     */
    private var jwtIssuer: String? = null
    
    /**
     * JWT 有效期（秒）
     */
    private var jwtExpirationSeconds: Long = 3600
    
    /**
     * 认证类型
     */
    var authType: AuthenticationType = AuthenticationType.NONE
        private set
    
    /**
     * 配置 API 密钥认证
     */
    fun configureApiKey(apiKey: String? = null): String {
        authType = AuthenticationType.API_KEY
        val key = apiKey ?: UUID.randomUUID().toString()
        apiKeys[key] = Principal(
            userId = "system",
            roles = listOf("admin"),
            permissions = listOf("*")
        )
        return key
    }
    
    /**
     * 配置 JWT 认证
     */
    fun configureJwt(secret: String, issuer: String, expirationSeconds: Long = 3600) {
        authType = AuthenticationType.JWT
        jwtSecret = secret
        jwtIssuer = issuer
        jwtExpirationSeconds = expirationSeconds
    }
    
    /**
     * 配置 OAuth2 认证
     */
    fun configureOAuth2(clientId: String, clientSecret: String, authorizationUrl: String, tokenUrl: String) {
        authType = AuthenticationType.OAUTH2
        // OAuth2 配置
    }
    
    /**
     * 配置基本认证
     */
    fun configureBasic(username: String, password: String) {
        authType = AuthenticationType.BASIC
        // 基本认证配置
    }
    
    /**
     * 注册 API 密钥
     */
    fun registerApiKey(apiKey: String, principal: Principal) {
        apiKeys[apiKey] = principal
    }
    
    /**
     * 验证 API 密钥
     */
    fun validateApiKey(apiKey: String): Principal? {
        return apiKeys[apiKey]
    }
    
    /**
     * 生成 JWT 令牌
     */
    fun generateJwtToken(userId: String, roles: List<String>, permissions: List<String>): String {
        // JWT 令牌生成
        return "jwt-token"
    }
    
    /**
     * 验证 JWT 令牌
     */
    fun validateJwtToken(token: String): Principal? {
        // JWT 令牌验证
        return null
    }
    
    /**
     * 验证 OAuth2 令牌
     */
    fun validateOAuth2Token(token: String): Principal? {
        // OAuth2 令牌验证
        return null
    }
    
    /**
     * 验证基本认证
     */
    fun validateBasicAuth(username: String, password: String): Principal? {
        // 基本认证验证
        return null
    }
    
    /**
     * 检查权限
     */
    fun checkPermission(principal: Principal, permission: String): Boolean {
        return principal.permissions.contains("*") || principal.permissions.contains(permission)
    }
    
    /**
     * 检查角色
     */
    fun checkRole(principal: Principal, role: String): Boolean {
        return principal.roles.contains("admin") || principal.roles.contains(role)
    }
}

/**
 * 安全主体
 */
data class Principal(
    /**
     * 用户 ID
     */
    val userId: String,
    
    /**
     * 角色列表
     */
    val roles: List<String>,
    
    /**
     * 权限列表
     */
    val permissions: List<String>
)
